You think having kids will fuck up your life?
That is what LIFE is about. You love her? She loves you? and you are LUCKY enough to get pregnant?
You have not even the vaguest idea of what is important in life, and should you flush your good fortune down the toilette, you will be one sorry cunt in 20 years.
If you DONT love her, and DONT think you should be together or DONT have the balls to be a man and take care of you actions, then by all means, get the abortion, you would make a shitty father with those credentials anyway.